Possible diffusion paths in this material were considered. It was found that the preferred path for diffusion was markedly affected by the distribution of ions between the Li and Nb sites. Site swapping was important, both in creating non-stoichiometric material and in impurity incorporation. Published data on diffusion rates were compared with the possible diffusion mechanisms. Atoms of Ti (which were thought to substitute mainly for Nb) appeared to diffuse more rapidly on the Li sub-lattice in Li-deficient samples.

D.P.Birnie: Journal of Materials Science, 1993, 28[2], 302-15